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HM Digital Water Resistant Ec TDS Meter w Temperature Harvest & Storage Calcium (Ca) and Magnesium (Mg) Water Pumps Aeration & Irrigation Calcium (Ca) and Magnesium (Mg) alleviate the potential elemental problems commonly seen in this unique growing media because they powerfully deliver these critically essential secondary and micronutrients to your valuable plants at the most crucial time so you get the optimized yields you desire 1 American National Standards reef tanks reliable EC TDS meter that is ideal for testing applications such as hydroponics
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